/usr/share/racket/pkgs/trace/calltrace.rkt is in racket-common 6.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | ;; Poor man's call tracer.
(module calltrace mzscheme
(require "calltrace-lib.rkt")
(provide instrumenting-enabled)
(current-eval calltrace-eval-handler))
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